fix: use concrete load document in refresh regression fixtures

src/endor_host.rs

@@ -4183,7 +4183,6 @@ page.render(block)
             "item = RectBlock(2,20)\nrow = Row(0,0,{children})\npage = Page()\npage.render(row)"
         );
         let (mut session, initial) = ReplSession::load(&source, "app.main", 273, 1).unwrap();
-        let initial = initial.unwrap();
         let old_version = initial.frame.layout_version;
         assert_eq!(initial.frame.mounts.last().unwrap().x, 158.0);
         let first = std::collections::BTreeMap::from([(
@@ -4228,7 +4227,7 @@ page.render(block)
             "state = ui.state(0)\npage = Page()\npage.render(ui.textOf(state,\"value\"))\na = ui.after(ui,\"a\",0,state.increment)\nb = ui.after(ui,\"b\",0,state.increment)",
             "app.main", 274, 1,
         ).unwrap();
-        let old_version = initial.unwrap().frame.layout_version;
+        let old_version = initial.frame.layout_version;
         let viewports = std::collections::BTreeMap::new();
         assert!(
             session